How do I parent another object only to a specific bone?
You can parent an object to a specific bone using a 'Child Of' constraint:



Here, the object I want to parent to an individual bone has a 'Child Of' constraint added, with the armature and bone I want it to follow selected from the 'Target' and 'Bone' search boxes.

Pressing the 'Set Inverse' button may be required to return the object to it's original position as after choosing the target object it may jump to that bone's position.